chore(themes): Added Prussian theme by @divyakelaskar (#123)

* Update .gitignore

* added new theme

* reverted changes in .gitignore

themes/index.js

@@ -71,6 +71,12 @@ const themes = {
     text_color: "f8f8f2",
     bg_color: "282a36",
   },
+  prussian: {
+    title_color: "bddfff",
+    icon_color: "38a0ff",
+    text_color: "6e93b5",
+    bg_color: "172f45",
+  },
 };
 
 module.exports = themes;